Jeremiah 21:5

And myself will fight against you
So far from being entreated to do for them according to his wondrous works in times past, as their friend; that he will set himself against them as their enemy; and sad it is to have God for an enemy: if God be for a people, none can be against them to do them any hurt; but if he is against them, it signifies nothing who is for them: this must be much more terrible to them than the whole Chaldean army, and the king of Babylon at the head of them: with an outstretched hand, and with a strong arm;
such as he had used formerly in delivering Israel out of Egypt, but now in delivering them into the hands of their enemies; and out of the reach of such a hand there is no getting; and under the weight of such an arm there is no supporting; see ( Exodus 6:6 ) ( 13:9 ) ; even in anger, and in fury, and in great wrath;
because of their sins and iniquities. This heap of words is used to show the greatness of his indignation: this was not the chastisement of a father, but the rebuke of an enemy; not a correction in love, but in hot displeasure; a punishment inflicted in vindictive wrath by a righteous Judge, appearing in a warlike manner.